I've had success with Basal Branch Nerve Blocks, in my upper back C6- T6 which in turn lead to RFA's. Basal Branch Blocks allow the doctor to focus on sensory bundles so they can use a stronger anesthetic. In contrast with a spinal nerve block, where they have to limit the anesthetic since they will be impacting motor as well as sensory nerves and in that region if you deaden a motor nerve related to your autonomic functions like breathing, well you get the idea.
I've also has both the BBNB's and RFA's in my lower back, T7-S1 with less benefit at this point in time but I attribute that more to my recent choice of bicycling as a mode of transportation after 4 years of not cycling. My reasoning is that most of our thigh muscles have their origin in the lower back and cycling really impacts those muscles in a radically different way than say skiing does. I can ski a full day and my legs will tire before my back as long as I avoid moguls, getting air and catching an edge.
So I guess the question now is what type of epidural are we discussing in your case??? Any injection that goes below the dermis is an epidural so it really helps to clarify what kind of procedure we are talking about...